21x^2+17x=8

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Solution for 21x^2+17x=8 equation:


Simplifying
21x2 + 17x = 8

Reorder the terms:
17x + 21x2 = 8

Solving
17x + 21x2 = 8

Solving for variable 'x'.

Reorder the terms:
-8 + 17x + 21x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + 17x + 21x2 = 0

Factor a trinomial.
(-8 + -7x)(1 + -3x) = 0

Subproblem 1

Set the factor '(-8 + -7x)' equal to zero and attempt to solve: Simplifying -8 + -7x = 0 Solving -8 + -7x = 0 Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + -7x = 0 + 8 Combine like terms: -8 + 8 = 0 0 + -7x = 0 + 8 -7x = 0 + 8 Combine like terms: 0 + 8 = 8 -7x = 8 Divide each side by '-7'. x = -1.142857143 Simplifying x = -1.142857143

Subproblem 2

Set the factor '(1 + -3x)' equal to zero and attempt to solve: Simplifying 1 + -3x = 0 Solving 1 + -3x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -3x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -3x = 0 + -1 -3x = 0 + -1 Combine like terms: 0 + -1 = -1 -3x = -1 Divide each side by '-3'. x = 0.3333333333 Simplifying x = 0.3333333333

Solution

x = {-1.142857143, 0.3333333333}

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